i dont actually know what a node or a directed graph is :( is it that im too stupid or are you being more general than would be expected? idk but for my benefit could you explain it a bit more clearly? thanks

A node is a location. For example, if you were planning a trip, you would of course establish a path that would get you to your destination fastest. On a map, each city would represent a node that you may travel into and away from.